/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.jpom.util;

import cn.hutool.core.io.file.FileNameUtil;
import cn.hutool.core.util.StrUtil;
import cn.jiangzeyin.common.DefaultSystemLog;

import java.security.CodeSource;

/**
 * VersionUtils.
 * Just read MANIFEST.MF file and find Implementation-Version property
 *
 * @author Hotstrip
 */
public final class VersionUtils {

	private static final String VERSION = getVersion(io.jpom.util.VersionUtils.class, "1.0.0");

	private VersionUtils() {
	}

	/**
	 * Gets version.
	 *
	 * @return the version
	 */
	public static String getVersion() {
		return VERSION;
	}

	/**
	 * Gets version.
	 *
	 * @param cls            the cls
	 * @param defaultVersion the default version
	 * @return the version
	 */
	public static String getVersion(final Class<?> cls, final String defaultVersion) {
		// find version info from MANIFEST.MF first
		String version = cls.getPackage().getImplementationVersion();
		if (StrUtil.isEmpty(version)) {
			version = cls.getPackage().getSpecificationVersion();
		}
		if (!StrUtil.isEmpty(version)) {
			return version;
		}
		// guess version fro jar file name if nothing's found from MANIFEST.MF
		CodeSource codeSource = cls.getProtectionDomain().getCodeSource();

		if (codeSource == null) {
			DefaultSystemLog.getLog().warn("No codeSource for class {} when getVersion, use default version {}", cls.getName(), defaultVersion);
			return defaultVersion;
		}
		String file = codeSource.getLocation().getFile();
		if (file != null && file.endsWith(FileNameUtil.EXT_JAR)) {
			file = file.substring(0, file.length() - 4);
			int i = file.lastIndexOf('/');
			if (i >= 0) {
				file = file.substring(i + 1);
			}
			i = file.indexOf("-");
			if (i >= 0) {
				file = file.substring(i + 1);
			}
			while (file.length() > 0 && !Character.isDigit(file.charAt(0))) {
				i = file.indexOf("-");
				if (i < 0) {
					break;
				}
				file = file.substring(i + 1);
			}
			version = file;
		}
		// return default version if no version info is found
		return StrUtil.isEmpty(version) ? defaultVersion : version;
	}
}


